Remove SiblingTraversalStrategies include from StyleResolver.

Remove SiblingTraversalStrategies include from StyleResolver.

SiblingTraversalStrategies were unused in StyleResolver.h, but some files
relied on ElementTraversal being included via StyleResolver.h.

R=jchaffraix@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192384

[rune, 2015-03-23 17:06:50]

Split out from https://codereview.chromium.org/1023393002/

[Julien - ping for review, 2015-03-23 17:31:47]

The CQ bit was checked by jchaffraix@chromium.org

[Julien - ping for review, 2015-03-23 17:31:48]

lgtm

[commit-bot: I haz the power, 2015-03-23 17:32:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1026483003/1

[commit-bot: I haz the power, 2015-03-23 17:38:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-23 17:38:31]

Try jobs failed on following builders:
  blink_presubmit on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/2...)

[rune, 2015-03-23 17:41:14]

rune@opera.com changed reviewers:
+ adamk@chromium.org

[rune, 2015-03-23 17:41:15]

Added adamk@ for Source/web

[Julien - ping for review, 2015-03-23 17:41:40]

jchaffraix@chromium.org changed reviewers:
+ japhet@chromium.org, pdr@chromium.org
- adamk@chromium.org

[Julien - ping for review, 2015-03-23 17:41:40]

+Nate/Philip: Can I haz a web/ OWNER stamping?

[adamk, 2015-03-23 17:43:51]

adamk@chromium.org changed reviewers:
+ adamk@chromium.org

[adamk, 2015-03-23 17:43:52]

lgtm for Source/web

[rune, 2015-03-23 18:13:01]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2015-03-23 18:13:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1026483003/1

[commit-bot: I haz the power, 2015-03-23 20:28:49]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=192384